Grounding of pole line 12.47kV wye circuit

[joshtrevino]

I have a customer who has an incoming three phase 12.47kV circuit (3 bare phase conductors on crossarms with a static/neutral below the phases) coming into the facility from the utility. The circuit passes through the utility metering point and becomes customer owned (premises wiring) at a customer owned recloser. The circuit (now customer owned) continues into the facility in the same configuration described above feeding many customer owned three phase transformers (with both delta and wye primary connections). There are also single phase transformers for lighting, recloser control power, etc fed by the 12.47kV circuit. It seems to me that the neutral/static is also functioning as the EGC (equipment ground conductor) back to the source. For example, there is no separate EGC for the recloser housing. I am working on a project for which I will be modifying this system and want to understand how this configuration fits into the NEC, especially article 250. I know outside the facility the utility is governed by NESC, but inside the facility NEC is the governing standard. What article in NEC (2023 please) allows for this grounding configuration for a medium voltage pole line circuit?

Please let me know if I need to provide further details or clarity.